Locomotive driving box



July 28,1925. 1,547,667

A. F; PITKIN LOCOMOTIVE DRIVING BOX Filed Aug. 11. 1923' Patented July28, 192.5.

ARTHUR F. PITKIN, OF SCHENEGTADY, NEW YORK.

LOCOMOTIVE DRIVING BOX.

Application filed August 11, 1923. Serial No. 656,846.

To all whom it may concern Be it known that I, ARTHUR F. PITKIN, ofSchenectady, in the county of Schenectady and State of New York, haveinvented a certain new and useful Improvement in Locomotive DrivingBoxes, of which improvement the following is a specification.

The objects of my invention are to provide, in a locomotive driving box,means whereby the longitudinal play that obtains in driving boxes of theordinary construction, may be automatically taken up, and means foraffording increased bearing surface below the centre of the axle.

The improvement claimed is hereinafter fully set forth.

In the accompanying drawing: Figure 1 is an axial section through alocomotive driving box, illustrating an application of my invention, onthe line a a of Figs. 2 and 3; Fig. 2, a rear View, in elevation, of thesame; Fig. 8, a vertical central section; Fig. 4, a view, inperspective, of an adjusting wedge; Fig. 5, a similar view of a sidebrass; and, Fig. 6, a partial end view, on an enlarged scale, showingthe manner of inserting the side brasses.

In the practice of my invention, referring descriptively to the specificembodiment thereof which is herein exemplified, the drivin box, 1, isfitted with a crown brass,

1, which is fixed in the box by being pressed thereinto, in the ordinarymanner, and with side brasses, 2, which are curved in conformity withthe axle journal, and are fitted in recesses, 1 which extendhorizontally in the inner sides of the driving box, the side brassesextending both above and below the horizontal central plane of thedriving axle, as most clearly shown in Fig. 2. Longitudinal movement ofthe side brasses, relatively to the driving box, is prevented by lugs, 2formed on the tops of the side brasses, at about the middle of theirlength, and engaging recesses, 1, in the driving box, above those inwhich the bodies of the side brasses are fitted.

The inner sides of the driving box are, for a distance equal to thedepth of the side brasses, machined on vertical planes to form therecesses, 1*,the faces of which are inclined from the front to the rearof the box, as shown in Fig. 1, and correspondingly inclined adjustingwedges, 3, are interposed between the inclined surfaces of the drivingbox and the side brasses. The adjusting wedges are pressed inwardly,thatis to say, towards their narrower ends, against the side brasses, 2,by. springs, 5, which surround stems, 3 on their wider ends of thewedges, and bear on said wider ends, and on abutments, 41:, secured tothe rear end of the driving box by bolts, 4*.

In the operation of a locomotive driving box in which my invention isapplied, it will be seen that a material increase of bearing surface onthe axle journal, is obtained by the provision of the side brasses, andthat longitudinal play thereof, in the driving box, is effectuallyprevented by the engagement'of' the lugs on the tops there of, with thedriving box. Wear of said brasses is automatically taken up by theadjusting wedges, crown brass, under the of the springs thereon. Theconstruction is a simple and inexpensive one, and is readi- 1yadaptable, without modification of, or

constant pressure interference with, the usual accessories, to

driving boxes of the present standard constructions.

I claim as my invention and desire to secure by Letters Patent:

In a locomotive driving box, the combination of a crown brass rigidlyfitted in the box, side brasses movably fitted in the box and separatedfrom said crown brass,

central lugs on said side brasses engaging recesses in the box toprevent relative longitudinal movement of said side brasses, and

spring-pressed wedge-shaped members fitted in the box behind said sidebrasses for taking up the wear of the latter.

W S. FRAME, D. S. COLEMAN.

independently of the

